Centrifugal fan BD 12/12 M6 0.76 kW

Casals BD 12/12 M6 Double-Inlet Centrifugal Fan – Industrial Performance at 230V

The double-width double-inlet (DWDI) centrifugal fan BD 12/12 M6 by Casals is the high-performance solution for air handling units (AHU), HVAC systems, HoReCa installations and large commercial applications. Delivering 6510 m³/h via a single-phase 230 V IP55-protected motor and a glass fibre reinforced polyamide impeller, this fan combines high aerodynamic efficiency with proven reliability and minimal maintenance.

Robust construction designed for integration

The galvanised steel casing provides excellent corrosion resistance, suitable even for moderately humid environments. The glass fibre reinforced polyamide impeller is lightweight, impact-resistant and dynamically balanced, ensuring quiet operation and sustained aerodynamic efficiency throughout its service life. Included mounting brackets allow quick integration into equipment, air handling units or standalone installations.

Casals anti-vibration system – minimum noise

The exclusive Casals motor mounting system uses flexible arms with vibration dampers, effectively isolating the motor from the casing and the building structure. The result is significantly lower noise levels than conventional designs, while also extending bearing life and the overall service life of the assembly.

Closed IP55 motor – designed by Casals

The single-phase asynchronous IP55 motor, insulation class F, with extruded aluminium finned casing, is specially designed by Casals for ventilation applications. It features:

• Integrated thermal protection – automatic shutdown on overheating
• Efficient fin cooling – continuous operation in demanding conditions
• Voltage-based speed control – airflow adjustment without costly additional equipment (note: does not apply to three-phase motors, which use frequency control)

IP65 connection box – maximum electrical safety

The IP65 connection box protects electrical connections against dust ingress and water jets, ensuring safe operation even in high-humidity environments or near water sources.

Compliance and options

The fan complies with RoHS Directive 2002/95/EC, guaranteeing the absence of hazardous substances. On request, it can be supplied in a sound-insulated BOX version for duct mounting – see the BOX BD PLUS 12/12 M6 product available on ventilation.ro. Fitting a gravity return air damper on the discharge is recommended to prevent reverse airflow when the fan is stopped.

Recommended applications

The BD 12/12 M6 is suitable for: air handling units (AHU) and HVAC systems, hotels, restaurants and professional kitchens, shopping centres and offices requiring high airflow, clean-air industrial installations, fresh air supply systems in buildings, replacement of worn fans in existing installations.

Key advantages:

• DWDI design – high airflow 6510 m³/h in a compact footprint
• IP55 Class F Casals-designed motor – superior reliability
• Anti-vibration flexible arm system – reduced noise and wear
• GF polyamide impeller – lightweight, durable, quiet
• Voltage-based speed control – airflow adjustment without inverter
• IP65 connection box – electrical safety in humid environments
• RoHS compliant – eco-friendly product
• Available in sound-insulated BOX version

TECHNICAL SPECIFICATIONS TABLE:

FAQ – FREQUENTLY ASKED QUESTIONS:

Q: What does "double-inlet" (DWDI) mean and why does it matter? A: Double-width double-inlet (DWDI) means the impeller draws air simultaneously from both sides. Compared to a single-inlet fan of the same size, the DWDI design achieves a considerably higher airflow – in the case of the BD 12/12 M6, up to 6510 m³/h – in a compact footprint and at lower noise levels. This makes it ideal for air handling units, HVAC systems and commercial applications where space is limited but high airflow is required.

Q: What type of motor does the BD 12/12 M6 have and how is overheating protection handled? A: The motor is a closed single-phase asynchronous type with IP55 protection and insulation class F, specially designed by Casals for ventilation applications. The extruded aluminium finned casing ensures efficient cooling. The motor features integrated thermal protection that automatically stops the fan if the temperature exceeds the rated limit, restarting after cooling without manual intervention.

Q: How is airflow controlled on the BD 12/12 M6? A: Airflow is controlled by voltage variation – an electronic speed controller (TRIAC or autotransformer) reduces the supply voltage and therefore the motor speed, lowering the airflow. This method is simple and cost-effective. Note: voltage-based control does not apply to three-phase motors, which require frequency variation (inverter drive).

Q: What is the difference between the BD 12/12 M6 and the BOX BD PLUS 12/12 M6 version? A: The BD 12/12 M6 is supplied as a standalone unit intended for integration into air handling units, equipment or custom installations. The BOX BD PLUS 12/12 M6 includes the same fan mounted in a sound-insulated enclosure with connecting flanges, ready for duct mounting. The BOX version significantly reduces noise transmitted to the surroundings and simplifies installation where no custom housing is available.

Q: What accessories are recommended for the BD 12/12 M6? A: A gravity return air damper on the discharge (e.g. Gravity Grille B 400×350 mm) is recommended to prevent reverse airflow when the fan is stopped. An ITRS 9-100 DT electronic speed controller enables precise airflow control. If installed without a BOX enclosure, fitting an anti-vibration flexible connector on the inlet and/or outlet is recommended to minimise vibration transmission to the building structure.

Q: Is it compatible with BMS automation systems? A: Yes. Via a speed controller with 0–10 V analogue input or a frequency inverter, the BD 12/12 M6 can be integrated into Building Management Systems (BMS) for automatic airflow control based on CO₂, air quality, temperature or differential pressure sensors.

Q: What is the maximum air temperature for this fan? A: The maximum recommended air temperature for continuous operation is 40°C. The fan is not approved for conveying explosive or flammable gases and is not ATEX certified.

Q: How can I order or request technical advice? A: You can order through the product page form, or contact us at +40 722 667 239 (phone/WhatsApp) for free technical advice on selecting the right fan, accessories and speed control solutions for your installation.